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DEC21X4X: dont copy data when receiving.

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git-svn-id: svn://kolibrios.org@5184 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
hidnplayr 2014-11-21 12:26:02 +00:00
parent 7199705b05
commit e54f076e14
1 changed files with 23 additions and 34 deletions
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57
drivers/ethernet/dec21x4x.asm
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@ -1134,7 +1134,7 @@ proc transmit stdcall bufferptr, buffersize
mov [esi + desc.length], eax
; set descriptor status
mov [esi + desc.status], DES0_OWN ; say it is now owned by the 21x4x
mov [esi + desc.status], DES0_OWN ; say it is now owned by the 21x4x
; Check if transmitter is running
set_io [ebx + device.io_addr], 0
@ -1227,7 +1227,7 @@ int_handler:
push eax esi ecx
DEBUGF 1,"TX ok!\n"
.loop_tx:
; go to last descriptor
; get last descriptor
mov eax, [ebx + device.last_tx]
mov edx, sizeof.desc
mul edx
@ -1240,10 +1240,10 @@ int_handler:
je .end_tx
mov [eax + desc.buffer1], 0
DEBUGF 1, "Free buffer 0x%x\n", [eax + TX_RING_SIZE*sizeof.desc]
DEBUGF 1,"Free buffer 0x%x\n", [eax + TX_RING_SIZE*sizeof.desc]
invoke KernelFree, [eax + TX_RING_SIZE*sizeof.desc]
; next descriptor
; advance to next descriptor
inc [ebx + device.last_tx]
and [ebx + device.last_tx], TX_RING_SIZE-1
@ -1254,6 +1254,7 @@ int_handler:
;----------------------------------
; RX irq
test eax, CSR5_RI
jz .not_rx
push eax esi ecx
@ -1264,13 +1265,13 @@ int_handler:
.rx_loop:
pop ebx
; get current descriptor
; get current descriptor
mov eax, [ebx + device.cur_rx]
mov edx, sizeof.desc
mul edx
lea edi, [ebx + device.rx_ring + eax]
; now check status
; Check current RX descriptor status
mov eax, [edi + desc.status]
test eax, DES0_OWN
@ -1282,51 +1283,39 @@ int_handler:
test eax, RDES0_ES
jnz .end_rx
mov esi, [edi + RX_RING_SIZE*sizeof.desc]
; Calculate length
mov ecx, [edi + desc.status]
shr ecx, RDES0_FL_SH
and ecx, RDES0_FL_MASK
sub ecx, 4 ; crc, we dont need it
DEBUGF 1,"size=%u, addr:0x%x\n", ecx, esi
push esi edi ecx
invoke KernelAlloc, ecx ; Allocate a buffer to put packet into
pop ecx edi esi
test eax, eax
jz .fail
sub ecx, 4 ; throw away the CRC
DEBUGF 1,"got %u bytes\n", ecx
; Push arguments for Eth_input (and some more...)
push ebx
push dword .rx_loop
push ecx eax
xchg edi, eax
push .rx_loop ; return addr
push ecx ; packet size
push dword[edi + RX_RING_SIZE*sizeof.desc] ; packet ptr
; update statistics
inc [ebx + device.packets_rx]
add dword[ebx + device.bytes_rx], ecx
adc dword[ebx + device.bytes_rx + 4], 0
; copy packet data
shr cx, 1
jnc .nb
movsb
.nb:
shr cx, 1
jnc .nw
movsw
.nw:
rep movsd
; Allocate new descriptor
push edi ebx
invoke KernelAlloc, 1536 ; Allocate a buffer to put packet into
pop ebx edi
mov [edi + RX_RING_SIZE*sizeof.desc], eax
invoke GetPhysAddr
mov [edi + desc.buffer1], eax
mov [edi + desc.status], DES0_OWN ; mark descriptor as being free
mov [eax + desc.status], DES0_OWN ; free descriptor
; Move to next rx desc
inc [ebx + device.cur_rx] ; next descriptor
and [ebx + device.cur_rx], RX_RING_SIZE-1
jmp [Eth_input]
.end_rx:
.fail:
pop ecx esi eax
.not_rx:
pop edi esi ebx